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・ Petalidium coccineum
・ Petalifera
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・ Petaling (disambiguation)
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Petalite
・ Petalium
・ Petalium alaseriatum
・ Petalium alternatum
・ Petalium bicolor
・ Petalium brevisetum
・ Petalium californicum
・ Petalium debilitatum
・ Petalium evolutum
・ Petalium incarinatum
・ Petalium incisum
・ Petalium knulli
・ Petalium longulum
・ Petalium schwarzi
・ Petalium seriatum


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Petalite : ウィキペディア英語版
Petalite

Petalite, also known as castorite, is a lithium aluminium phyllosilicate mineral LiAlSi4O10, crystallizing in the monoclinic system. Petalite is a member of the feldspathoid group. It occurs as colourless, grey, yellow, yellow grey, to white tabular crystals and columnar masses. Occurs in lithium-bearing pegmatites with spodumene, lepidolite, and tourmaline. Petalite is an important ore of lithium, and is converted to spodumene and quartz by heating to ~500 °C and under 3 kbar of pressure in the presence of a dense hydrous alkali borosilicate fluid with a minor carbonate component. The colorless varieties are often used as gemstones.
==Discovery and occurrence==

Discovered in 1800, by Brazilian naturalist Jose Bonifacio de Andrada e Silva. Type locality: Utö Island, Haninge, Stockholm, Sweden. The name is derived from the Greek word petalon, which means ''leaf''.〔
Economic deposits of petalite are found near Kalgoorlie, Western Australia; Aracuai, Minas Gerais, Brazil; Karibib, Namibia; Manitoba, Canada; and Bikita, Zimbabwe.
The first important economic application for petalite was as a raw material for the glass-ceramic cooking ware CorningWare. It has been used as a raw material for ceramic glazes.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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